Gerard ROBIN composed on 2017-01-18 14:33 (UTC+0100):
I installed stretch on a external usb hard drive and when I boot on the had drive and I shut down, then I boot again, but on the internal hard drive, with jessie, the time is delayed by one hour.
I would like to know if this is normal, and if not what can I do to fix the problem ? (Without going into the bios or using date ...)
It's a old laptop acer aspire 5102 wlmi
Check to see if /etc/adjtime in both installations is different. One is probably UTC and the other LOCAL. If one hard drive contains Windows and the other does not, more than likely the one with Windows says LOCAL and the other says UTC. Synchronizing both should eliminate the clock changing.
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